Street art used to mean spontaneous scribbles under the cover of darkness; now those images hang in major museums and sell at auction for millions. A new exhibition at the Petit Palais in Paris is celebrating the universal language of street art. “We Are Here” features work from around the world, including an installation by French artist Seth. He tells us how collaborating with people around the world has informed both his style and the way he creates his pieces, and why we should adopt more of a child-like attitude when we encounter artwork in galleries.